Hydraulic oscillation centering device

Abstract

The invention relates to the technical field of centering devices for well drilling and completion work, and discloses a hydraulic oscillation centering device. The hydraulic oscillation centering device comprises an outer cylinder, an eccentric rotating inner cylinder and an annular gland. An annular end cover is fixed to the inner side of the upper end of the outer cylinder. The eccentric rotating inner cylinder which can rotate in the outer cylinder in an eccentric mode under the impact of fluid is arranged in the outer cylinder in a sleeved mode. The annular gland is fixedly installed at the position, corresponding to the position below the eccentric rotating inner cylinder, inside the lower portion of the outer cylinder. The annular gland and the annular end cover are respectively provided with at least one circulating passageway which is communicated with the inner portion of the outer cylinder in the circumferential direction. The hydraulic oscillation centering device is reasonable and compact in structure; the hydraulic oscillation centering device drives a sleeve to shake, and therefore generated vibration waves can impact on sleeve columns and wash away mud cakes on the well wall; viscosity of displacing liquid is reduced, and therefore the displacing liquid can easily flow, displacing efficiency is improved, and meanwhile cementing of cement sheathes and the well wall and cementing of the sleeve columns and the well wall are facilitated, the density degree of set cement is increased, and therefore well fixing quality is effectively improved; the hydraulic oscillation centering device can be applied to any well condition and any stratum and has a good effect on low-pressure stratums which are prone to leakage.

Description

technical field [0001] The invention relates to the technical field of centralizers for drilling and completion operations, and relates to a hydraulic vibration centralizer. Background technique [0002] In the actual drilling and completion operations, cementing is the finishing project of a well, and its quality is related to the quality of the whole well and whether the well can be handed over. Therefore, improving the quality of cementing has become an important task for all companies engaged in cementing and completion technology. Important goals that are constantly being pursued. Casing centering and displacement efficiency of cement slurry are the key factors affecting the cementing quality; currently, in order to ensure the above two conditions, elastic or rigid centralizers are usually used to ensure the centralization, and the displacement rate and flow rate are increased to ensure the cementing quality. The cement slurry creates turbulent flow to increase displac...

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a hydraulic oscillation centralizer, which overcomes the above-mentioned deficiencies in the prior art, and can effectively solve the problem that existing centralizers cannot The turbulent state of slurry replacement, low replacement efficiency and poor cementing quality

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